Knife grinder support for woodworking machines



"Au 30 1932- L. T. MEDHOLDTA 1,874,331`

KNIFE GRINDER SUPPORT FOR WOODWORKING MACHINES g Filed may e. 1951'v 2 sheets-sheet 1 A TToRNEY. v

Aug. 30, 1932.,

Filed May 6, 1931 2 Sheets-Sheet 2 INVENTOR.

' Low-s Tfedboldf ATTORNEY.

Patented Aug. 30, 1932 v'UNITED STATES LOUIS T;

PATENT [OFFICE MEDHOIJD'I", or' cIiIcrNNATL oHIo, 'AssIGNon To TIIE .1.1.4. FAY a EGAN com- KNIFE caminan SUPPORT? ron woonWonxINe MACHINES V;

Application mea May s, 1931A.` seriarNo. 535,453. y l i Heretofore in machinesof this class it has Y been the common practice to provide sharpening means for the cutting blades consisting w ing stone. These three units have been removably mounted upon a single rail carried by the' machine `but the manner in which eral objections, to-wit: Being supported by one rail, the grinder as well as the j ointing stone and setter have been overhung or supported on one side only.v As the Vjointing stone and setter are not heavy units, one rail is usually sufficient but theV grinder, due to its weight, has some tendency to vibrate, which impairs the accuracy to which the blades must be ground. vAnother objection of mounting the grinder bythe overhung method or upon one rail only is that it must be of very heavy and rigid construction and as it mustbe removed after the blades are a grinder, as will be presently described, I

have overcome the above-mentioned objec,

more positions to the motor which is advanf tageous in grinding knives to concaved or straight bevels;` also, with a decrease in the weight of the grinder, one man can easily attach or remove the unit, when desired.

rlhe objects of my invention, briefly stated, are to provide an improved support for grinders of woodworking machines which isf simple, efficient, durable and of considerably less weight than the grinders heretofore used for this purpose.

These and other objects ofthe invention.

fshownfin connection therewith; and

of a blade setter, grinder and so-called j oint- Vith my improved method of mountingf `14 by screws 17, .as clearly illustrated, thus I permitting the sliding movementof saddle VY14 upon rail 9. Bracket 18 is removably fixed to saddle 14 bybolts 19 and is provided with made to the 'accompanying drawings, where- 111... Fig. 1 is an end elevational view of my 1n;-

lvention shown partly in vertical section with frag fentary parts of a surfacing machine G7,

' Fig.A 2 is area'r elevation thereof, lor aview parts being omitted.'

j ln describing the nature of my'invention 45 Ihave selected for purposes of illustration flocking inthe directionof arrowy A in Fig.A

a surfacer, and' shown only those parts of the y machine lassociated with the invention. they have been supported by the rail has sev- Y Referringto Fig.' 1, the'numeral ddesigin bearings in the upper'portion of the frame 3, and V5 thecutter head which is provided with removable cutting blades V6.` A pair cfm uprights 7, formedintegral with frame 3,

are recessed at 8, to receive the cross rail 9,

y said rail being rigidly Xed to said uprights lby meanslsuch asl the bolts'lO. vThe ends off-,5, Y

rail 9 form bearings toreceivethe feed screw 75 lland one end of said screw Ais provided with "apin 12 whereby a hand crank (shown -by ground it often requires the services of two broken lines in Fig. il) can be used or'rotat ingsaid screw for reasons presently described.,.I In the present showing, frail 9 is mounted 30 horizontally and crosswise ofthe machine and located above the plane of rollers4-4 and cutter head 5,',1and is provided with Vdovetailed slideways-13-13 upon which saddlej-,f

14 is mounted for sliding movement. 'The 55 upper slideway 13 lof rail 9 (as viewed in Fig. `1) fits' into thedovetailed recess 15 of saddle 14 and the lower slideway 13 engages Y gib 16, the latter being secured to saidsaddle-.

a split bearing llazatV its ends to receive shaftn 20. This shaft 2() isV fixed to the arm 24S-in 95 any `suitable manner tas, for example, by rset 'i screw 20a and is free to move in thefsplit Vbearings 18a. l will be made to appear in the course of the following description in which reference is I y Y `Should anyv wear occur between the shaft and` the)V split bearin s, suola@ wear can be compensated for by tig tening f100 the screws 186, as will be readily apparent in Fig. 1. Shaft 20, therefore, pivotally supports the end 22 of arm 23, as clearly shown in Fig. 1. The other end, or end 24 of said arms 23 is provided with a screw t-hreaded opening 25 to receive the threaded screw 26, the lower end of which screw has an integrally formed knob or ball 27 pivotally fitting within sliding member 28. The lock nut 29 is adapted to retain theadjustment of said screw 26 within end24 of arm 23. The sliding member 28 is supported upon the top surface of horizontal bar 21, which bar is adjustably held within the frame 3 by setscrews 30 and 31, the set-screw 30 serving to retain the adjustment of said bar 21 and the set-screw 31 serving to adjust the bar vertically, which adjustment is maintained by lock-nut 32.

Arm 23, as shown in Fig. 1, is rovided with an enlargement or boss 33 suitalbly bored out to receive sleeve 34, which sleeve is adapted to he adjusted vertically within the bore of 'said boss 33 by the threaded-screw 35 and attached hand wheel 36.

, The swivel connection between the motor 37 and arm 23 will now be described:

Motor37 is supplied with two lugs or ears 38738 suitably bored out to receive the axle shaft 39, `as shown in Fig. 1. This Vshaft 39 is also received by the prongs 40-40 of the bifurcated or forked member 41. Set-screws 42.-42 serve to lock the shaft. 39 with the prongs v4O-40 of member 41 and set-screws 43-43 serve to retain the desired adjustment of'the motor 37 upon shaft 39. The bifurcated or forked member 41 is held within the sleeve 34 by the swivel bolt 44. Locking relative -to said arm, whereby Vibration of said motor and arm is reduced to a minimum by the use of said pair of rails for supporting said arm. Y

LOUS T. MEDHOLDT.

screw 45 threaded into the boss 33 serves to j hold the member 41 in adjusted position.

' From the foregoing description, it will be clearlyapparent that the motor 37' is rigidly suspended from arm 23 in a manner capable of being adjusted in all directions, which, as abo-ve stated, aids materially in positioning the grinding wheel 46 relative tothe plates 6 `of the cutter head`5.

While I, have shown my improved knife grinder support in use on a surfacing machine, it is not my intention that it be limited to this use. It maybe adapted to any machine having cutting blades which are sharpened without removing them from the machine. It will be obvious to those skilled in the art that various changes may be made in my device without departing from the spirit of the invention and I, therefore, do not limit myself to what is shown in the drawings and described in the specification but only as set forth in the appended claim.

Having thus .fully described my said inventfon,. what I claim as new and .desire to secure by Letters Patent is:

A grinder structure of the class described .Y eomprisingthe combination of an arm, a 

